6533b85afe1ef96bd12b935f
RESEARCH PRODUCT
The size of X arg(-V-ts V-tb(*) V-cs(*) V-cb) and physics beyond the standard model
Juan Antonio Aguilar SaavedraFrancisco J. Botella OlcinaGustavo Castelo BrancoMiguel Nebot Gómezsubject
High Energy Physics::PhenomenologyFísicaHigh Energy Physics::Experimentdescription
We analyse the allowed range of values of chi, both in the Standard Model and in models with New Physics, pointing out that a relatively large value of chi, e.g. of order lambda, is only possible in models where the unitarity of the 3x3 Cabibbo-Kobayashi-Maskawa matrix is violated through the introduction of extra Q=2/3 quarks. We study the interesting case where the extra quark is an isosinglet, determining the allowed range for chi and the effect of a large chi on various low-energy observables, such as CP asymmetries in B meson decays. We also discuss the correlated effects which would be observable at high energy colliders, like decays t -> cZ, modifications of the cross section and forward-backward asymmetry in e+ e- -> ttbar and the direct production of a new quark.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-01-01 |